DE2121962A1 - Lift cart to be operated while walking - Google Patents

Description

The invention relates to a lift truck to be operated while walking with a reversible drive motor of the Control means can be actuated, in turn via a connecting rod subject to the action of a control element, the control element and the connecting linkage being a To be able to take forward, a zero and a reverse position, and with a 'when hitting an obstacle during forward travel relative to the hand truck displaceable element, the displacement of which is a reversal of direction of the drive motor causes.

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HAMBURG U76 07 · IANK, COMMERZBANK, HAMBURG, 53/22904 · TElEGR .. SPECHTZIES HAMBURG or SPECHTZIES MÖNCHEN

According to the invention, a lift truck of this type is characterized in that the manually operable Control element by means of a releasable coupling to the connecting rod is connected and that the displaceable element releases the coupling when it is moved as well as a movement 'of the displacement linkage from the independently of the manually operable control element Causes forward to reverse position, with a ^ subsequent return of the displaceable element in

its starting position after reversal of movement of the hand truck away from the obstacle, the connecting rod returns to its zero position and thus stops the hand truck, whereupon the releasable coupling automatically engages again only when the manually operated control element has also returned to its zero position.

Accordingly, should the user hold the manually operated control element in the forward position,

after the lift truck hit the obstacle and is reversed, there is no renewed forward travel of the hand truck after it has moved away from the obstacle. Of the Rather, the lift truck stops, and it is necessary that the user use the manually operated control element returns to zero pitch to re-engage the releasable coupling before the pushcart can be driven forwards or backwards again.

The releasable coupling can comprise a ratchet mechanism which, when the sliding of the sliding Elements mechanically disengages.

The latch mechanism is preferably disengaged against the action of a spring which automatically brings the releasable coupling back into engagement when both the connecting rod and the manually operated control element assume their zero position.

The ratchet mechanism may include a ratchet that sits on a portion of the linkage and can be brought into engagement with a stop on a part movable with the control element. The attack can be designed as a recess or recess of this part. The part of the linkage and the one with the Control element movable parts can be arranged coaxially rotatable.

A portion of the displaceable member may be arranged so that "it engages the pawl and the pawl during a first portion of its displacement moved out of engagement with the stop while it is in the course of a second portion of its displacement engages on part of the connecting rod and moves it in such a way that it comes into its rearward position.

10 9 8 5 2/117 7 *

The displaceable element can be arranged pivotably on a part of the lifting trolley.

In each of the arrangements described, a spring is preferably provided to the connecting. rod returned to its zero position.

A more detailed description of the invention follows with reference to the accompanying drawing, on which an embodiment of the device according to the invention is shown is. The drawing shows in:,

Fig. 1 is a side view of a walking to ^actuation: constricting Hubkarrens;

Fig. 2 is a vertical partial section along the line 2-2 according to Fig. 1 and partly a side view of the steering and control arms of the lifting trolley according to FIG. 1;

Fig. 3 is a vertical section along the line J5-5-nach Fig. 2.

According to FIG. 1, the lifting truck to be operated while walking has a vehicle body Io with a load carrier section 11 attached to it and a combined one Steering and control arm 12, which can be pivoted on the vehicle box sits, namely at the end facing away from the load carrier section. The steering and "control arm 12 can

1 ΰ 9 8 5 2/1 1 7 7 ^ »" r ^ i ';

Pivot about a horizontal axis that runs transversely to the lift truck. Pivoting around a vertical axis is also possible. The pivoting movement of the steering and control arm about the horizontal axis engages and releases a brake of the lifting cart, the steering and control arm being spring-loaded in the direction of its vertical position. A pivoting movement of the steering and control arm about its vertical axis causes a steering movement of a driven, controllable ground wheel 14, which sits below the vehicle body and is provided with a reversible drive motor within its hub. Handles 15 are provided on the steering and control arm to enable the user to pivot the arm around the vertical axis and thus to steer the lifting trolley «u», * _f « *" - "· 'f'" ^ *

The load carrier section 11 of the hand truck can be relatively "zum FahrzeugEasten I" ö ängenöberfurid aBgesenlct "wercten," ~~ namely by means of at least one piston work machine, not shown, which can be operated by lifting and lowering buttons on the steering and control arm'12.

Control means are provided with the motor driving the ground wheel 14 connected in the manner to be described by controls in the form of wing levers 16 on the steering and control arm 12 can be actuated.

- 5 109852/1177 originally inspected

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According to Fig. 2 and J ?. two wing levers 16 are provided. Each carries an extension 17, which sits in a bearing of the steering and control arm 12 and one central hexagonal opening for receiving a shaft 2 ^ having. This shaft connects the paddle levers 16 to one another. On the shaft 25 between the wing levers 15 sits a round ratchet wheel 2o, and on opposite Lever plates 21 are arranged on the sides of this ratchet wheel 2o. Each of the lever plates has an opening into which a reduced diameter part 12o of the ratchet wheel 2o engages. The lever plates 21 can therefore rotate together around the axis of the shaft 2p.

The lever plates 21 are connected by means of a pin 24, "■ ftuf fwel ehern
net is ../ In addition to Kl

scliwenlebair ^r eiife ^ Klinice Lnke 25 sits e ^ ine roller 26, whereby

the Ümfangskänte the groove 26UiId 'a nose 27 of the pawl

Hebelplarten 21 hlnai

"25 over the edges" of the lifting buttons STTim protrude. This can be seen on the basis of FIG.

Dftä der'Nas ^ e 27 turned away * end of the latch 25 can engage in a recess 28 in the peripheral surface of the ratchet wheel 2o. The pawl becomes the engagement in the recess loaded by a leaf spring 29, which is on a ' from one of the lever plates 21 protruding pin jto sits. An operating rod 31 connected to the control means of the hand truck drive motor is connected, has

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10 9 8 5 2/1177 bad orjginai.

at its upper end a connection to the lever plates 21 in the form of a ball joint, which at a pin j52 extending between the lever plates is seated. The end of the leaf spring 29 is against the pin 32 on.

The actuating rod 31 goes through two arms 33 a trough-shaped bracket 133 of the steering and control arm 12 through. The actuating rod 31 is surrounded by a helical spring 34 between the arms 33, · '" which rests against stops 134 of the actuating rod 31. The attacks, for their part, hit the arms of '33 Bracket 133 on. The arrangement is such that the spring 34 in a known manner both in a upward, as well as with a downward ^ ge. __,

directed movement of the operating rod 3I is compressed. '■

From Figures 2 and 3 it follows that a ver |

Slidable element 35 is seated pivotably on a shaft J> 8 of the steering and control arm 12. The upper surface of the element 35 protrudes beyond the edge of the handle of the steering and control arm. ■ '

The displaceable element 35 is provided with a column '37 which, at its lower end, has a curved' · * ■ '... ■ .-: ■

- Y -

109852/1 177 -,: ■ v,; : \

Cam surface 38 carries. A helical compression spring 39 sits between stops 4o and. 4-1, each on the displaceable element 35 and on the steering and control arm

The arrangement is operated in the following way: If the valley take their position according to FIG. 2, - so are the wing levers .16 and the actuating rod 31 in their zero position. The wheelbarrow stands still ... One. Rotation of any one of the wing levers 16 in the clockwise direction according to FIG... 2 leads to a rotation of the ratchet wheel 2o, also in a clockwise direction. Since the _,; If the pawl 25 engages in the recess 2ß, the lever plates 21 also rotate clockwise. The. Actuating rod 31 accordingly moves upwards and this sets the control means of the drive motor into operation in a known manner in such a way that the lifting truck moves forward, ie towards the user. ™ The speed of the lifting trolley depends on how much the wing levers.16 are turned.

Similarly, rotation of the wing levers will result 16 counterclockwise to the fact that the operating rod 31. is moved down and that the hand truck drives backwards.

109852/1177

Does the hand truck move forward, i.e. to the right In Fig. 1, the steering and control arm 12 is in the lowered position, as shown in dash-dotted lines Lines is shown. As soon as the hand truck hits an obstacle, for example against the user, so the displaceable element 35, which sits at the end of the steering and control arm 12, is pressed down. The cam surface meets the nose 27 of the pawl 25 and swings the latter out of engagement into the recess

28 of the ratchet wheel 2o. This interrupts the Coupling between the operating rod 31 and the shaft 23, whereupon the operating rod is under the action the spring 3 ^ moves to the zero position, independently on the position of the wing levers 16 and the shaft 23. The movement of the actuating rod 3I into its zero position brings the drive motor of the hand truck to a standstill.

If the element 35 is pressed down further, it engages the cam surface 38 on the roller 26 and rotates the Lever plates 21 counterclockwise relative to the ratchet wheel 2o. This rotation of the lever plates 21 against the The actuating rod 31 moves clockwise downwards and lets the hand truck drive in the opposite direction.

A truck of turns on the obstacle, so the pressure on the member 35 is canceled, so that

- 9 109852/1177 '

the latter under the action of the spring 39 in its starting position returns. At the same time, the spring 34 moves the operating rod j51 upwards, causing the lever plates 21 must be turned clockwise to its zero position and switch off the motor.

If the actuating rod j> 1 and the lever plates 21 also reach their zero position, then if the user does not react all the time and the wing lever 16 is in the forward position * the recess 28 is still not in a position in which it is Latch 25 can accommodate. The lift truck therefore stops, although the wing levers 16 are in their forward position. This prevents the occurrence of an effect which can result in known lifting carts, namely that the lifting cart again moves forward to hit the obstacle and then moves back and forth back and forth until the wing levers are released.

In the present arrangement, the pawl 25 can only engage again in the recess 28, after the wing levers 16 have been released and under the action of the spring j54 in their zero position 2 and 3 have moved back. After this process has expired, the hand truck can be returned to Be put into operation. '

- Io 109852/1177

Claims (9)

Pa te nt to s ρ ν ü che. _r Vl) In going to be actuated A truck with a reversible drive motor which can be actuated by control means, which in turn subject to a control element. Via a connecting rod to the action, wherein the Steuereleu ~ 'and the linkage, a forward, a neutral and a reverse position can take , " and with an element which can be displaced relative to the lifting truck when an obstacle is encountered during forward travel, the displacement of which causes a reversal of direction of the drive motor, characterized in that the manually operable control element (16) is attached to the connecting rod (21j 31, 32) is connected and that the displaceable element 05) releases the coupling when it is displaced and, independently of the manually operated control element, causes the connecting rod to move from the forward to the reverse position, with a subsequent return of the displaceable element to its starting position Reversal of movement of the lifting trolley away from the obstacle returns the connecting rod to its zero position and thus stops the lifting trolley, whereupon the releasable coupling only automatically engages again when the manually operated control element - 11 109 852/1177,. . . No. ₁ . , '. ,. .. Also, has returned to its zero position. 2. Lift truck according to claim 1, characterized in that the releasable coupling (25, 28) comprises a ratchet mechanism which can be mechanically disengaged when the displaceable element is displaced. ■ '. ~ 3 lift trucks according to claim 2, characterized in that that the latch mechanism can be disengaged against the action of a spring (29), wherein the spring engages the coupling (25, 28) again when the connecting rod (21, j5l, 52) and that manually actuatable control element (1 $) take their zero position. 4. Lift truck according to claim 2 or 5, characterized in that the ratchet mechanism is a Pawl (25) which is attached to a part (21) of the connecting rod and in a stop (28) can engage on a part (2o) which can be moved with the control element. 5. Lift truck according to claim 4, characterized in that g e k e η η-z e i c h η e t that the stop (28) is designed as a cutout or recess of the part (2o). ; J '- 12 - 1098S2 / 1177 6. Lift truck according to claim 4 or 5 *, characterized in that the part 21 of the connecting rod and the part (2o) movable with the control element can be rotated coaxially. 7. Lift truck according to one of claims 4 to 6, characterized geke η η ζ ei ο h η e tj that the displaceable element (35) has a portion (38) which during a first part of the displacement of the element on the pawl ( 25) engages and moves the latter out of engagement with the stop (28) and engages the part (21) of the connecting rod during a second part of its displacement movement and moves the latter in such a way that it assumes its reverse position. 8. Lift truck according to one of claims 1 dead 7 * characterized by the fact that the movable Element (35) is pivotally attached to part of the fiubkarrena. 9. Lift truck according to one of the claims X hl * 8, marked is worthwhile duroh an "eder 04) for returning the" connecting linkage ^ s (31, 31 * 32) in the zero position. . i %: ϊ Blank page